Typewriter with type wheel and normal keyboard



Aug. 8, 1939 s. LOEWENBUCK TYPEWRITER WITH TYPE WHEEL AND NORMALKEYBOARD 11 Sheets-Sheet 1 WN Q M WM. h M4 L M. .0 cu w a J o N mm MW 0I n .l Q mm RN Q 0 w I w wN m fi A 0 SN R Am I w m l lfll hn HHHHHH HHHHUM l m l I! I W IN i 5 ,QL.

15 1 laewenzzwk Aug. 8, 1939 S. LOEWENBUCK TYPEWRITER WITH TYPE WHEELAND NORMAL KEYBOARD Filed Sept. 12, 1936 ll Sheets-Sheet 2 Aug. 8, 1939s. LOEWENBUCK TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept.12, 1936 ll Sheets-Sheet 3 5, laewenfizwk 6 Edema 1939 s. LOEWENBUCK2,168,824

TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept. 12, 1936 llSheetsSheet 4 i w L 7 i s I l E I 1 \L 5 h I k v I Q l i i w Q Q i I i II l I I b I i 2 I j g m 5. Laewenfiudi Owl/neg Aug. 8, 1939 s.LOEWIENBUCK TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD llSheets-Sheet 5 3 w M V p w l 5 Filed Sept. 12, 1936 Aug. 8, 1939 s.LOEWENBUCK 2,168,824

T'YPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept. 12, 1956 11Shets-Sheet a m M w W o L 6 Aug. 8, 1939 s. LOEWENBUCK 2,158,824

TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept. 12, 1956 llSheets-Sheet 7 Aug; 8, 1939 s. LOEWENBUCK TYPEWRITER WITH TYPE WHEEL ANDNORMAL KEYBOARD 11 Sheets-Sheet 8 Filed Sept. 12, 1936 M MW W 8, 1939 s.LOEWENBUCK 2,168,824

TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept. 12, 1936 11Sheets-Sheet 1o 5 i106 weub wall? N amey 8, 1939 s. LOEWENBUCK 2,168,824

TYPEWRITER WITH TYPE WHEEL AND NORMAL KEYBOARD Filed Sept. 12, 1936 llSheets-Sheet l1 Patented Aug. 8 1939 UNITED STATES ATENT FFECETYPEWRITER WITH. TYPE WHEEL AND NORMAL KEYBOARD Sebastian Loewenbuck,Zurich, Switzerland Claims.

The present invention relates to a typewriter with type wheel andkeyboard. The novelty of the invention resides in the fact, that therotation and the return of the type wheel, as well as 5 the stroke ofsame take place automatically by means of the tension of a spring, whichon its part is brought about by the carriage spring. The winding of thespring, however, may be effected also by pressing down the keys. Thisnovelty affords the possibility of building a typewriter with typewheel, that permits of acquiring a high writing-velocity, when the keysare operated with a light and short touch.

In addition to these main characteristics the machine shows a number offurther innovations, which appear in the drawings, more particularlythat the stroke of the type wheel is performed as the keys come back,and that the spring causes the type wheel to strike first and aftercompletion of the stroke through further releasing, effects its returnto normal position.

A further innovation of the machine is the driving arrangement by meansof push keys, and the peculiar manner of arresting the type wheel bymeans of a comb, that moves to and fro underneath the keys, and is ofspecial new shape inasmuch as the number of its teeth is less than thenumber of key pins against which it comes to strike.

0' With the above and other objects in view that will become apparent asthe nature'of the invention is better understood, the same consists inthe novel form, combination and arrangement of parts hereinafter morefully described, shown in 5'the accompanying drawings and claimed.

In the drawings:

Figure 1 is a fragmentary top plan view, part1 in section of atypewriter constructed in accordance with the present invention;

6' Figure 1a is an end elevational View partly in section of themechanism shown in Figure 1;

Figure 2 is a diagrammatic view, partly in section showing the relationbetween the platen and type wheel;

Figure 2ais a diagrammatic top plan of the type wheel and supporttherefor;

Figure 3 is a fragmentary top plan View of another form of type wheeltypewriter con" struction;

Figure 3a is an end elevational view, partly in section of the mechanismshown in Figure 3;

Figure 4 is a fragmentary top plan View of another form of type wheeltypewriter construction;

5 Figure 5 is a fragmentary top plan view of another form of type wheeltypewriter construction;

Figure 5a is an end elevational view partly in section of the mechanismshown in Figure 5;

Figure 6 is a fragmentary top plan view of another form. of type wheeltypewriter construc tion;

Figure 6a is a fragmentary top plan view of another form of type wheeltypewriter construction;

Figures? and 7a are end views respectively of different types of banksof key pins;

Figure 8 is a fragmentary plan view of another form of operatingmechanism;

Figure 9 is a fragmentary plan view of another form of constructionwherein the carriage and type wheel are operated in the absence ofsprings; and

Figures 10, 10a, 10b and 100 diagrammatically illustrate the principlesof operation of the foregoing types of machines.

The accompanying drawings, Figure 1, show a form of construction of theinvented typewriter. By striking a key, the key pin l, which issupported in the slots of the guiding combs til, is displaced forwardlyat a certain angle whereby the butt-end [4 of the key pin descends andpasses into the path of the oscillating comb 92; The displaced keycauses the tipping of the part it, which is turnably mounted. Aconnecting piece El is pivotally connected to the part it and moves in aforward direction as the part it is tilted, causing the rotation of thepart it which, in known manner by means of two teeth 26 and 2!alternately engaging in the rack of the carriage, allows escapement ofthe carriage to the next following tooth. The carriage is pulled inknown manner by means of a string 24 connected to a spring. The casingof the carriage spring 25 is provided with teeth 25. During each releaseof the spring the teeth of the casing cause part 27 to be presseddownwardly which, by means of its pin til, moves the arm 36 about itsaxis 5i, whereby the part 38 is moved upwardly, and the spring it isbrought under tension. The tilting device It, by means of a butt-end 55,simultaneously causes the part 54 to rotate, whereby the catch 52 ispushed underneath the part 38 and prevents the release of the spring 49.The teeth 25 of the spring casing 25, as it revolves, and as they pressdown the part 2'! and the part 30, simultaneously cause the rotation ofthe part 32, which is supported at 58 and is carried along by the pin 29of the part 30. The part 32 causes the displacement of the part 33,which is provided with the fork 34. The catch 36 snaps into the nose ofthe part33, and prevents the release of the spring 35 which is connectedwith part 33. When the fork 34 is displaced it comes to strike againstthe pins 6 and of the segment 8 and effects the rotation of the latterwhereby the segment comes back to its initial position. The segment 8meshes with the pinion 9 mounted on the axis of the type wheel 48, andalso returns the type wheel to its normal position. The catch 21 isforced down by the teeth of the spring casing 25 until it rotates bystriking against the pin 5| and disengages its nose from the teeth 26 ofthe spring casing. At that moment, a split spring 28 secures thereversing motion of the pin 60, whereby the arms 3|] and 32 recovertheir rest position, and the catch 21 engages with its buttend in thenext following tooth of the spring casing 25.

The axis 48, Fig. 2a, of the type wheel I0 is mounted at the point 62 ona rocking shaft 41. This shaft 41 is pivotally mounted in the guides 6|.The pinion 9 which is mounted on the axis of the type wheel and engageswith the segment 8 is mounted at a height on the axle 48 such as to belevel with the bearing points 6|. This arrangement affords thepossibility that the pinion 9, in spite of the axis 48 of the type wheelbeing tilted, retains its contact with segment 8, and constantly andeffectually engages in the teeth of the segment. The shaft 41 isprovided with an upward pin 46 and a downward pin 45 as shown in Figure2. The part 38 is provided with a butt-end 4!! on its upper part, and abutt-end 4| on its lower part, the latter being shaped so as to form amovable catch. When the machine is at rest, the catch 4| bears againstthe pin 45.

After the stroke on the key has been effected, the key pin I is takenback to its initial position by the tilting device I6 and brought to itsinitial position. The tilting device I6 is divided into two equal parts,and consists of a right and a left half. The left half is provided witha spring, and may be pushed forwardly independently, whereas the righttilting device l6 always carries along with it the left half. Themachine part 33 is equipped with a kind of tilting part 5 whichalternately raises the one, or the other end, as the case may be,whether the right-hand one or the left-hand one of the tilting-devicesH3 is set into motion by the key. The tilting part 5 thus gets intotouch, now with the one, now with the other pin 6 and l, of the segment8. When the key pin returns to its initial position, whereby the part i6also moves back at the same time, the connecting element H, by means ofthe butt-end l8, causes the catch 36 to rotate, whereby the part 33 isreleased. The spring 35 is then released, and causes part 33 to followalong, back to its initial position, whereby one of the pins 6 and 1,according to whether a key on the right hand or left hand part of themachine has been struck and according to which end of the tilting part 5is in contact with these pins, is set into motion by the tilting part 5and the segment 8 is rotated, to the right when the lower pin is setinto motion and to the left when the upper one is set into motion. Thisrotation, however, only takes place until the comb l2, which is carriedalong by the segment 8 by means of its pins H, strikes with one of itsteeth against the key pin that happened to be struck. Every one of theteeth of the comb I2 is intended for a whole group of keys. The fourteeth which are provided on each side of the comb on the right and left,when at rest are at different distances from the keys situated next tothem, whereby is obtained that the comb, according to which one of thekeys is struck, will make different movements. After the type wheel hasbeen adjusted to a certain letter, the tilting device I6, during itsfurther return movement, causes the part 54 to rotate backwardly, as aconsequence of which the catch 52 disengages part 38, which in turn ispulled dowrnvardly by the spring 49. During this motion, the partstrikes on a pin 45, by means of the catch-shaped bi end 4|, whereby thetype wheel it strikes. against the platen 56. In the last moment beforethe we wheel strikes the platen, the catch M discn, itself by strikingagainst the pin '3 After type wheel has reached the platen and theprinting has been effected the part 38 with its nose :27? comes intocontact with a pin :36 above the re"- volving point of the axis of thetype wheel, pushes it backwards, whereby the shaft ll rotates tar-kwards, and returns the axis of the type wheel to its rest position. Thesame process takes place when the other keys are struck.

Another form of construction of the invented typewriter is shown inFigs. 3 and 3a. When a key is struck, the key pin I, as described, movesrearwardly, wherefore the guides 63 of the hearing rods are providedwith little rollers, so as to facilitate the movement of the keys. Theright hand tilting device l6 is provided on its rear end with a bridge64. This bridge bears in front of the blade 65 against the key pinstruck. The bridge 64 bears behind the blade '55 against the key pinsremaining at rest whereby the neutral keys are arrested until the keypin struck has returned to its initial position. During the forwardmovement of the tilting device IS the connecting rod H is also pushedforwardly whereby the part 66 rotates and with its upper tooth engagesin one of the teeth of the ratchet wheel 61. At the same time, part 66pushes the catch 68 off the ratchet Wheel, whereby the part 69, to whichthe catch is attached, drops and releases the small board 16 which isbrought under tension by the spring 1!. The part 13 is at 12 pivotallyconnected to the small board 70. The part i3 is hollowed out in thecentre, and its right hand and left hand parts show cut-outs. In one 01"these cut-outs, when in rest position, one of the pins 14 is stationed,which pins are attached to the segment 8. The small board 10, ondropping, is accompanied by the part 13, which strikes against a pin'14, thereby causing the segment 8 to revolve. On striking against theleft-hand tilting device Ilia, the part 13 reverses its motion, movingleftwards while the part 15 causes the part 16 to rotate, and displacesthe part 13 towards the left by means of a connecting element 77. Thisreversal causes the right hand pin M to be struck and in this way thesegment 8 revolves towards the right. The pinion l8, mounted on the axleof the ratchet wheel 61, engages with its teeth in the rack of thecarriage.

When the tilting device |6 and the part i! are pushed forwardly thecatch 19 is carried along forwardly and moves to a point slightly beyondthe catch 80. The catch 8| simultaneously snaps into the slot 82 of thepart IT. The catch 33 supports the part 83 which in turn maintains thepart 84. The catch 85, an attachment to the part 84, acts with itstoggle on the lower part of the axis of the type wheel 43. During thereturn movement of the key pin and of the part I 1, the catch 19 strikesagainst catch 80. The latter rotates, releasing the arm 83 which rotatesowing to the action of the spring 86 and simultaneously disengages thearm 8 3. The parts 841 and 59 are both supported at 81.

The released part 84 is pulled downwardly by means of spring 98, andwith the catch 85 mounted on it strikes against the axis 48 of the typewheel, below the point of rotation. The type wheel I9 strikes againstthe platen 56 until it is brought back to rest position by the butt end89, which is also mounted on part 84 and which strikes against the axisof the type wheel above the point of rotation or against the pin 36,above the shaft 41. The effecting of the stroke and return of the typewheel is effected in this form of construction, by one and the samespring 99, on the same principle as illustrated in the first form ofconstruction. The returning part ll, having been stopped by the catch Blin its return motion, after the disengagement of the catch 86 waseffected, remains stationary until the dropping arm 85 in the lastmoment, after the type wheel has effected its stroke, with its butt endrotates the catch M as a result of which the rod ii is disengaged, andthe part 66, by the spring of the tilting device it, is withdrawn fromthe tooth of the ratchet wheel 6?, whereby the pinion E8 issimultaneously disengaged and is rotated by the rack of the carriageuntil the catch 68, which has dropped on a tooth, is returned to itsrest position and also brings the arm 69, as well, back to its initialposition, the initial position being limited in an upward direction by astop.

Simultaneously an engaging pin on arm 69 returns the arm 84 to its restposition. The part 83 too, is brought back to its initial position byarm 69. The arm 69 on its return motion also brings the small board 19back to its initial position, and the butt surfaces 92 of the smallboard NE on their part strike against the pins M of the segment 8, andbring it back to its initial position whereby the type wheel is alsobrought back to its initial position. The part 93, being an attachmentto the arm 89, engages in pinion 95, whereby the axis 95, which isprovided with feed screws, sets the ink ribbon into motion. In Figure 3the segment 3 is provided at its extremity with fork-shaped ends 96. Therounded off portions of these ends are to meet the requirements in therotations of the segment, which must rotate through the same angle, fromletter to letter.

The forms of construction of the typewriter hereinabove described areprovided with push keys in accordance with the drawings. These push-keysretain their rest position by means of spring-arms 91 of a commonspring-surface 98, and are brought back to their initial position afterthe keys are struck. However, the push keys are merely'supposed toaiford a simplified construction of the machine. The typewriter may alsobe driven by normal balancing keys, the levers of which are pivoted onan axis, and which in, known manner, when the key is pressed down, bymeans of push pins push forwardly the tilting devices It. In this casethe push pins of the balancing keys'as in the constructions describedabove are provided with butt-ends pointing downwards, against which, asdescribed, the teeth of the selecting cam l2, Fig. 1, are intended tostrike.

Apart from the forms of construction described above, the typewriteraccording to this invention, which aims at an automatically driventypewheel, may also have forms: of construction differing from thepreceding ones, according to which the working is in part only eifectedautomatically. According to the form of invention shown in Fig. 4, thetype wheel is adjusted to a certain letter by pressing downwardly orpushing forwardly a key by hand. On the other hand the return of thetype-wheel to its initial position, after the printing stroke has beenperformed, is effected by the spring of the carriage. When a key l ispressed down, the machine part 99 which is pivotally mounted at I00,rotates in a circular way, the key pins with their arms is strikingagainst the bevelled, or sloping edge of the part 99. The bevelledportion of the part 99 has for its purpose the settlement of themovement of the keys during different rotations of the type wheel. Thisrotation causes the segment 8 to revolve by means of the connectingparts 19! alternatively rightwardly and leftwardly, according to whetherwe have struck with the right hand keys the part 99 or with the lefthand keys the part 99a. Before the keys strike with their butt ends Magainst the part 99, or 99a respectively, the part it causes thedisplacement of the part i! and causes part 66 to rotate, as describedin connection with the preceding construction, Fig. 3, and part 65, asdescribed, engages with its butt-end in one of the teeth of the ratchetwheel 67, and lifts the catch 98 oif the ratchet-wheel 6? whereby catch88 drops down on to the next lower tooth of the ratchet wheel andreleases the arm 89, which latter, as shown in Fig. 3, simultaneouslydisengages the small board 1E3, which is pulled downwardly by the springH. Only now the road is cleared for the rotation of the segment 8, andin this way also for the type wheel. As shown in Fig. 4, the segment 3is rotated by hand, until the selecting comb i2 strikes against one ofthe key pins which have been struck from time to time. During the returnmovement of the key, the stroke and return of the typ-e-wheei isperformed as illustrated in Fig. 3. Also the adjustment of the machineto its initial position takes place in the same manner as shown in Fig.

3. During the return upward movement of the small board It, the angles92 of the small board strike against the pins M and return the segment 8to its initial position.

In the last form of construction we dealt with an automatic performingof the stroke of the type-wheel, and an automatic return adjustment(return rotation) of the type wheel inasmuch as the spring of thecarriage effects the winding of the spring for the striking actionof-the typewheel, andreturns the type-wheel to its original position,whereas the adjustment of the typewheel to the required letter is doneby hand, whereby the spring H is not required to have any considerablestrength and the spring of the carriage is considerably relieved.

The spring of the carriage may be relieved further still in a form ofconstruction of the above typewriter, in which the carriage only cffectsthe winding of the spring for the type-wheel to perform its stroke,whereas the adjustment of the type-wheel, as well as its return to therest position, is eifected by hand, inasmuch as the parts 99 and 99a areprovided with springs which on striking a key are brought under tensionby hand at the same time as the rotation of the segment 3 takes place.The releasing of the key causes the springs of the parts 99 and 99a tobring the segment 8 back to its rest position. In this case the smallboard H! is no longer required. The mechanism, however, which bringsabout the stroke of the type-wheel and its return remains the same asshown in Fig. 3; i. e., the spring that effects the stroke of thetype-wheel is brought under tension by the carriage, and released, asdescribed, during the return movement of the key.

In the case last mentioned, there is also a possibility of entirelydispensing with the spring 90 of the arm 84, by linking the arm 84 tothe part IT in such a manner that a pin, attached to part I'I, engagesin a transverse slot, provided on the arm 84. In this case thetype-wheel effects its stroke and return movement through the action ofthe spring 88, Fig. 3, of the tilting device I6, the winding of which isdone every time a key is struck, and the release of which takes placesimultaneously with the releasing of the key, so that the spring, thatcauses the keys to come back, simultaneously causes the typewheel toperform its stroke and resume its original position.

The same effect can be obtained when the spring 88 of the tilting deviceI 6 is altogether omitted and the spring 90 of the arm 84 remains inuse. The arm 84 will then automatically repel the part I1 and thetilting device I6, as a result of which the key-pins are returned totheir original position.

Figure 5 shows a type of construction according to which the type-wheelselects its positions, with respect to the strokes it performs, inconjunction with the rotations of tubular shafts 99, inasmuch as thetype-wheel keeps revolving until one of the graduated sections that runalong the selecting edge of the shafts strikes against the interveningkey, the rotation of the shafts taking place either as described in theprevious instances, or by releasing a spring, the winding and rewindingof which is done by the carriage, or again, by causing the key-pins I tostrike directly with their noses I4, against the lower edge of theshaft, until the upper edge is brought to strike with one of itsgraduated sections against the intervening key-pin in Fig. 6a. The typeof construction, as shown in Figs. 5 and 5a, may be effected, moreover,by using, instead of two sectional tubular shafts, each corresponding tothe right-hand side, and the left-hand side of the machine,respectively, two shafts running all the way through, from right toleft, and mounted in a manner shown in Figures 6 and 6a, so that thesegment 8 works, rightward, with one of the shafts, while from the leftit works with the other one, by means of a rod, and so as to get one ofthe shafts to rotate backward, the moment the other one, butting,reaches with one of the graduated sections of its edge the key that waspressed down, the backward rotation going on till that moment, the twoshafts are mounted, eventually, one underneath the other. Thebutting-surfaces on the sectionally graduated edge of theselecting-tubes afford regularity as to the sliding motion of the keys.

As to the striking-motion of the type-wheel, its impulse may be secured,as shown by the previously described types of construction, by means ofa spring, the winding of which is done by the carriage, or else indirect conjunction with the pressing down of the keys, as shown by thesideprojection in Fig. 5.

Figures 6 and 6a show another type of the construction, as described.This type of construction provides, in addition to both tilting-devices99, on the right-hand, and left-hand side of the machine, a thirdoscillating-device, running all the way through from the right to theleft, and

working as a ratchet-contrivance, being equipped both ways, from theright and from the left, with a slanting, and sectionally graduatededge. That third tilting-device I02 is connected with the segment 8, bymeans of the arms I03, which encompass the pins !04. Segment 8, themoment one of the tilting-devices 99 is brought to intervene, causes thetilting-device I62 to move too. The segment is pivoted at I65. Part IE3engages part I62 in I56, somewhere below its centre of rotation, therebycausing the slanting edge I02 to strike against the key-pin, and to stopthe rotation of the segment 8. Owing to the fact, that the pins 24 aremounted farther away from the revolving-centre I of the segment 8, therun of the arms I93 is longer than the run of the arms IIlI, therebyaffording a possibility of providing the tilting-device I92 with deepersectional recesses than those shown in Figures 5 and 5a, and allowing,if necessary, greater margins with respect to every rotation of thetype-wheel. The working-impulse with which to operate the selectingcontrivance (tilting-device), as described, 99 and I52, may be securedby automatic means, in accordance with the previously described types ofconstruction, or else by getting the key-pins I to strike against theslanting edge of the tilting-device 99, by means of their noses. Figure7 shows a type of construction, in compliance with this invention, theparticularity of which lies in the fact, that the keys, instead of beingpush-keys, are of the balancing-type. The innovation in this respectlies with the key-pins, which, although mounted on one axis, common toall of them, and their lengths being different, always eFect one and thesame motion, on descending. This can be managed by providing thekey-pins with butting-legs of various lengths and shapes I3I, I32 andI33. Longer key-pins have longer butting-legs, and shorter key-pins haveshorter ones. The keys cause their respective butting-legs to strikeagainst the tilting-device IE, which is pivoted at I34. Arm 5! forms anattachment to the tilting-device I5, and is bound to effect the samemovement, throughout, when setting the machine to work. The longer keysstrike against part I6 at a point which lies closer to the centre ofrotation, whereas the shorter keys, correspondingly, strike against partI6, farther off from that centre. Thus key ib will effect the samedescending motion as key I.

Figure 8 illustrates an improvement regarding this invention inasmuch asthe whole workingprocess of the machine obeys direct compulsion,

and doe s so, in a way that the type-wheel can- 4 not possibly bebrought to effect its stroke before the selecting cam I2 has caused thetype-wheel to revolve to the point corresponding to the letter which isdemanded. For this purpose, a second cam I2a, placed above cam I2 hasbeen provided. Cam I2 carries a part I 93, which is pivoted on the pinII2. Part II3 encompasses within its slot a pin II4, which is mounted inthe upper cam I2a, as a result of which, the two cams I2 and I2a, onshifting respectively, cause part II3 to revolve, striking with itspulley against part IIG, which, being mounted in part H1, and ti1ting,is brought to move back. Part I I7 is pivoted in H8, causing by itsrotation the removal of arm II9, as a result of which the catch I29rotates, thereby disengaging part 83, and arm 84. The rest of theworking-process takes place as described heretofore. This improvementafl'ords absolute protection against the possibility of the type-Wheelbeing brought to effect its stroke before having revolved to theselective position corresponding to the letter that is demanded.

Figures 9 and 90. show a type of construction in accordance with thisinvention, providing for the carriage to cause with its motion,directly, without the intermediary of any spring, the type-wheel toeffect its stroke, or else, using a spring, the type-wheel to be broughtto its original position by the motion of the carriage. This innovationis possible, owing to a contrivance by which the spring of the carriage,on being released, will not cause the carriage to move at once, so thatits first release either causes the type-wheel to effect its stroke, andto move back, or to bring the type-wheel back after it has effected itsstroke. A further releasing of the spring sets the carriage into motion.Figures 9 and 9a show an example of this type of construction withregard to the above invention. The moment a key I is pressed down, thetype-wheel, as described before, is brought to revolve to its selectivepoint in conjunction with the corresponding key. The return of the keycauses part 66 to rotate, and the ratchet-wheel to be disengaged. Thespring of the carriage, by means of a cord I2I, is connected to amovable rack I22, at I23. The rack is mounted, flexibly, on thecarriage, and meshes with pinion 50. The release of the spring of thecarriage 25 causes a cord I2I to displace the movable rack I22, thuscausing pinion 50 and the ratchet-wheel 61 to revolve. Catch 68 israised by means of the ratchet-wheel, and carries with it part I24,which, by means of catch I25, secures the striking-motion and return ofthe type wheel, inasmuch as catch I25, as a result of arm I24 dropping,either strikes against the axis 48 of the type-wheel, or involves pin46, on the upper part of the shaft 41, catch I25, as shown above,disengaging itself just before the type-wheel effects its stroke,whereas part I26 of arm I24 brings the axis of the type-wheel back toits restposition. During this part of the process, the carriage, bymeans of a second rack I2I, is checked by part I28, the nose I29 ofwhich has been catching in the rack I21 and was stopped. Part I28,however, as part I24 keeps moving, releases the carriage which, inconjunction with the rack I21, by means of a catch I30, moves on.

Figure 10 shows a further development of the principles so far referred.to, inasmuch as the control of the type-wheel may be secured as follows:the segment 8, the moment the pinion 9, mounted on the axis of thetype-wheel 48, causes the rack I01 to be shifted to the right or to theleft, as the case may be with regard to the location of the keys on theright-hand side, or lefthand side of the keyboard, causes the arms I08to move, correspondingly to the right or to the left, as a result ofwhich the pins I09 strike against the nose of the intervening key, thusgetting the type-wheel to revolve to the selective position with regardto any definite letter. As to the arms I08, their normal positions maydiffer. The rod I'I in Figure 10a is mounted to move directly with thesegment when moving rightward, or leftward, alternatively. Figure 10billustrates a further example as to the various types of construction.It provides two arms, each, from the right and from the left, of thekind I08 referred to, their respective runs thereby being reduced, aswell as the impact, the normal position of those two pairs of arms I08being conditicned by the distance between the keys, with respect to oneanother, inasmuch as the first arm is located at that same distance fromthe key it is supposed to work with first, whereas the pin I09 on thesecond arm is at half that distance from the key it is to be in touchwith first. Figure 100 shows a type of construction that provides threearms, one in the centre, and the other ones working from the right andthe left, respectively. All the types of construction may provide directworking-impulse from the pinion 9, or from the segment 8, as regards therack I.

I claim:

1. In a typewriter, a type wheel, a board of keys which are operativelyconnected to the type wheel, a carriage, a spring operatively connectedto the type wheel for tilting it, means connected to the carriage forputting the spring under tension, and means operatively connected to thekeys for relieving the spring of its tension and allowing it to tilt thetype wheel.

2. In a typewriter, a type wheel, a board of keys which are operativelyconnected to the type wheel, a spring operatively connected to the typewheel for tilting it, manually operated means for putting the springunder tension, and means operatively connected to the keys for relievingthe spring of its tension upon the return movement of the correspondingkey and allowing it to tilt the type wheel.

3. In a typewriter, a type wheel, a board of keys which are operativelyconnected to the type wheel, a carriage, a spring operatively connectedto the type wheel for returning it to its original position, meansconnected with the carriage to place the spring under tension for allletters and signs of an entire line, means operatively connected to thekeys for partially relieving the tension of said spring as each key ispressed and allowing it to return the type wheel to its originalposition.

4. A typewriter as set forth in claim 3, characterized by the provisionof means for the striking of the type wheel during the rearward movementof the keys.

5. In a typewriter, a type wheel, a board of keys which are operativelyconnected to the type wheel, a carriage, a spring operatively connectedto the type wheel for tilting it, means connected to the carriage forputting the spring under tension, and means operatively connected to thekeys for relieving the spring of its tension and allowing it to tilt thetype wheel, a rack operatively connected with the type wheel and havingteeth less in number than the key bars against which they abut, meansoperatively connected to the keys to displace said rack (I2, Fig. 1) ina lateral direction until a tooth (I3, Fig. 1)

strikes against a key bar and the type wheel is adjusted to the requiredletter or sign.

SEBASTIAN LOEWENBUCK.

